Nokia’s Lumia 900 is poised to be the first Windows Phone device to embrace high-speed LTE data, and it certainly won’t be the last. One of the other LTE models we’ve been hearing about is Samsung’s SGH-i667, which we’ve known by codename Mandel. Back around CES-time in January, we looked at a User Agent Profile for the model that seemed to confirm its status as a Windows Phone handset. Today the i667 returns, this time showing up in FCC certification paperwork.

Sure enough, these docs confirm the phone’s LTE connectivity, sporting bands 4 and 17, which we recognize as those used by AT&T in the States. Beyond that, there’s the standard dual-band AT&T HSPA+, along with WiFi and Bluetooth.

Right now, we know very little else about the so-called Mandel, other than that it’s supposed to be what’s essentially a large-screen version of the Focus S. The lack of information about the Mandel, and the absence of any leaked roadmaps citing it, has us wondering just when Samsung might be planning to launch the phone. We haven’t heard it mention the model just yet, but based on these FCC docs, it seems like we could learn of its plans for the handset any day now.